cheap wireless keyboard modification


I have a cheap wireless keyboard, which is powered by two "AAA" batteries, and the wireless signal transmission and reception are very unstable, so I made some modifications to it.Use the old mobile phone lithium battery as the power supply for the wireless keyboard, To charge the battery, I connected a USB charging cable in parallel to the positive and negative poles of the battery. The solution to the unstable signal is to extend the antenna part of the keyboard circuit board, as shown in the picture, after testing, The signal becomes fairly stable, and the DIY is end.